<?php

namespace Aws\Api\Parser;

use Aws\Api\StructureShape;
use Aws\Api\Service;
use Aws\Result;
use Aws\CommandInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\StreamInterface;

/**
 * @internal Implements JSON-RPC parsing (e.g., DynamoDB)
 */
class JsonRpcParser extends AbstractParser {
	use PayloadParserTrait;

	/**
	 * @param Service $api Service description
	 * @param JsonParser $parser JSON body builder
	 */
	public function __construct(Service $api, JsonParser $parser = null) {
		parent::__construct($api);
		$this->parser = $parser ?: new JsonParser();
	}

	public function __invoke(
		CommandInterface  $command,
		ResponseInterface $response
	) {
		$operation = $this->api->getOperation($command->getName());
		$result = null === $operation['output']
			? null
			: $this->parseMemberFromStream(
				$response->getBody(),
				$operation->getOutput(),
				$response
			);

		return new Result($result ?: []);
	}

	public function parseMemberFromStream(
		StreamInterface $stream,
		StructureShape  $member,
		                $response
	) {
		return $this->parser->parse($member, $this->parseJson($stream, $response));
	}
}
